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    <title>Document</title>
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    <script>
        // 练习2：有已知以下某公司员工薪金信息，把每一位员工的salary薪金信息 加 2000，并返回新数组，注意：不影响原数组
        var persons = [
            {
                username: '张飞',
                sex: '男',
                salary: 50000
            },
            {
                username: '关羽',
                sex: '男',
                salary: 60000
            }
        ];
        var arr = JSON.parse(JSON.stringify(persons));
            console.log(persons);
        var newarr = arr.map(function(value,index){
            arr[index].salary += 2000;
            return arr[index];
        })
        console.log(newarr);
       
    </script>
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